22161616 has 10 divisors (see below), whose sum is σ = 42938162. Its totient is φ = 11080800.

The previous prime is 22161599. The next prime is 22161617. The reversal of 22161616 is 61616122.

It can be written as a sum of positive squares in only one way, i.e., 21344400 + 817216 = 4620^2 + 904^2 .

It is a super-2 number, since 2×22161616² = 982274447462912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692535 + ... + 692566.

Almost surely, 2^22161616 is an apocalyptic number.

It is an amenable number.

22161616 is a deficient number, since it is larger than the sum of its proper divisors (20776546).

22161616 is a wasteful number, since it uses less digits than its factorization.

22161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385109 (or 1385103 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 22161616 is about 4707.6125583994. The cubic root of 22161616 is about 280.8884027250. Note that the first 3 decimals are identical.

Adding to 22161616 its reverse (61616122), we get a palindrome (83777738).

The spelling of 22161616 in words is "twenty-two million, one hundred sixty-one thousand, six hundred sixteen".